Fifteen successive heats of a steel alloy are tested for hardness. The resulting data are shown in

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Fifteen successive heats of a steel alloy are tested for hardness. The resulting data are shown in Table 5E.9. Set up a control chart for the moving range and a control chart for individual hardness measurements. Is it reasonable to assume that hardness is normally distributed?
Fifteen successive heats of a steel alloy are tested for
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Managing Controlling and Improving Quality

ISBN: 978-0471697916

1st edition

Authors: Douglas C. Montgomery, Cheryl L. Jennings, Michele E. Pfund

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